Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fcdbbe6e6eae71…

MALICIOUS

PDF

92.6 KB Created: 2021-04-20 10:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f4262dcda12688e847bc57725f86c211 SHA-1: 32d10056ca34c35dcd51330123e8fc2eb16eafdf SHA-256: 70fcdbbe6e6eae7189adf80863d2ac2eaf4034fc6a7813cf621cc17111cb5256
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous other PDF documents hosted on various disposable domains, with one primary URL being https://xajibur.ru/strik?utm_term=barron%2527s+gre+words+with+sentences. The document body, though heavily obfuscated, suggests a lure related to GRE vocabulary, likely to entice users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/strik?utm_term=barron%2527s+gre+words+with+sentences PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5feaf1d014757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_603218acbd5aa.pdfIn PDF document text
    • https://miruvoxizoxu.weebly.com/uploads/1/3/5/3/135397032/9079524.pdfIn PDF document text
    • https://vurovovi.weebly.com/uploads/1/3/4/0/134040995/vudigex_kototuju_lusuritapasoko.pdfIn PDF document text
    • https://vemubofopelo.weebly.com/uploads/1/3/0/7/130776521/tizetolepov.pdfIn PDF document text
    • https://tigamapelexoka.weebly.com/uploads/1/3/4/6/134633170/8137531.pdfIn PDF document text
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/a9f4a6.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/2495618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_6033f0b63b718.pdfIn PDF document text
    • https://roxadaxakisa.weebly.com/uploads/1/3/1/4/131437443/ffc4bc0235a92.pdfIn PDF document text
    • https://lopolovugafi.weebly.com/uploads/1/3/4/1/134109017/jegudol_luzokosuluxix_zijafujeto.pdfIn PDF document text
    • https://simogewijak.weebly.com/uploads/1/3/4/6/134642120/memuxajuzani-dipofasexun-sogerakojiginud-deronanaxobura.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/949e0.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/51c73dbe8ae813.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_65ec10c6532b429bb8180b57bd8984f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01d179f-6d75-4817-98bd-153002b915c7/what_is_developmentally_appropriate_practice_for_infants_and_toddlers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91beb9c-adf3-4ba2-8f76-f1429b25de4c/43332297530.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_ad03a52a9e614367922c2ee119d7b489.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16efa6e-3826-45f3-bc9e-f875355c5d95/dramacool_house_of_spirits_tvb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 5132 bytes
SHA-256: 26ed068907bf9126add5bfa862355a94604a6676420c2655c2690a2c8995c1d0
font_01_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 10856 bytes
SHA-256: c2ed8f7fe5db4c2a6aa434396a2d3130ec179c4a39ac0af286474d732a08ed19
font_02_sfnt_off000140f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F7 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0
font_03_sfnt_off00015683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15683 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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